@adhdsupporthelp All of my older three have inattentive ADHD - as do I - and the youngest has his assessment later this month. Their diagnoses have all happened this year, so at the ages of 22, 20 and 18. What they found was that while the medication helps with focus, they've still had to do a lot of learning about organisation and time management - the meds just put their heads in the right place to do this, they weren't a magic cure. There are, and always will be, still things that they find more difficult and have to make specific efforts to do properly.
Although he might be reluctant to disclose it at sixth form, once he does, there are a raft of things they can do and should do and it will make his life a lot easier. Simple adjustments like getting slides sent through early, staff being aware that he might need things presented differently, regular check-ins with pastoral staff, use of tech to help with note taking, more flexible deadlines with homework make a real difference. It will also allow them to put in place arrangements for formal exams. Ds2 got his diagnosis just before his A Levels but the school were able to give him supervised rest breaks and he had regular prompts.
Looking ahead, it will also enable him to access proper support at uni, if that's the route he choose. Ds1 has flexible deadlines, a study mentor, access to the library at different times as well as specific software to help with essays. Ds2 is currently in discussion with the Disability team at his new uni to decide what he'll need in place to enable him to make the best of his studies. Dd is about to start a Masters and will also have specific arrangements in place, including doing it part-time over 2 years so it's easier to manage.
@Anothernamechangeplease Dd was exactly the same - A Levels were where it started to fall apart but we didn't find out why until after she'd struggled through her degree and her mental health was becoming compromised. She was the one who told me to go and get assessed 😁She doesn't regret getting the assessment and feels that it's helped her make sense of what she experienced before. Would your dd do one of the online assessments as a starting point?
The ADHD Foundation has some really good resources, as does Additude Mag
Good luck to both your dcs!